... China3. Raw material: High speed steel4. Type: External turning tools, M type turning tool holder5. Hardness: 62HRC6. Diameter: 12mm-40mm7. Overall ... 45HRC to 55HRC work material11. Controlling mode: CNC lathe, Turning machine12. Work material: Copper, Alloy steel, Tool steel, ... matching tungsten carbide inserts, mainly for high speed external turning on different metals less than 55HRC, also it can ...